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r <br /> ' C4lN'r'ntit!f R MA f <br /> GROUNDWATER ,",rg1 1 . }8 <br /> PL11-:11] TECHNOLOGY INC. <br /> � 140I Halyard Drive,Suite 140,West Sacramento CA 95691,(916)372-A704 <br /> FAX(916)372-8781 <br /> ' April 27, 1994 Project No 02070 5234 <br /> Mr Bob Vasquez <br /> ' The Southland Corporation <br /> Environmental Services <br /> 5820 Stonendge Mail Road, Suite 310 <br /> ' Pleasanton, California 94566 <br /> SUBJECT Addendum to Closure Report <br />' Southland Site No 20680 <br /> 5110 Thornton Road, Stockton, California <br />' Dear Mr Vasquez <br /> This Addendum to Closure Report provides an amendment to the Groundwater Technology, Inc <br /> Closure Report, dated Ma 21, 1993, which documented soil and groundwater remediation and <br /> requested closure at The Southland Corporation (Southland) Site #20680 located at 9110 Thornton <br /> Road in Stockton, California (Figure 1) This amendment is presented in response to requests for <br /> t additional information following discussions at a meeting between the California Regional Water <br /> 9 e <br /> Quality Control Board-Central Valley Region (CRWQCB-CVR), San Joaquin County Public Health <br /> Services (SJCPHS), and Groundwater Technology on December 15, 1993 The objective of the <br /> meeting was to discuss closure issues for this site The additional information presented in this <br /> report is in accordance with the Addendum to Appendix A to the Tri-Regional Board Staff <br /> Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites <br /> relating to requests for site closure Additionally, this report presents the results of a groundwater <br /> sampling event conducted jointly with representatives of the CRWQCB-CVR at the facility referenced <br /> above on January 24, 1994 <br />' BACKGROUND <br />' A precision underground storage tank (UST) test conducted on March 28, 1986 indicated a failure of <br /> the unleaded fuel tank system at the site On April 2, 1986, the unleaded tank and the associated <br />' dispensing system were shut down Groundwater Technology was contracted by Southland in April <br /> 1986 to investigate the site's subsurface for evidence of petroleum hydrocarbons The site <br /> Offices throughout the US Canada and Overseas <br />